Quite simple, and yet elegantly crafted to have its difficulties the more you play.
Reminiscent of Suika, your goal is to combine alike objects, and see how far you can go before you "overflow" (75 is the absolute limit).
You should avoid small objects finding their way to the top.
If you have ever played 2048, its just like how you want to avoid low numbers being at the top. And even in trying to do so, its extremely difficult to avoid.
11,000 is my high score, and that was on my first run. I have barely managed 8000 since.
This game is pretty unique and the roundness of the objects makes it more difficult.
Good luck!